TiO2 Anode Material for All-Solid-State Battery Using NASICON Li1.5Al0.5Ge1.5(PO4)3 as Lithium Ion Conductor

We have been developing sintered multilayer oxide-based all-solid-state batteries. Anode active material rutile-type TiO2 was not reacted with amorphous Na superionic conductor (NASICON)-type solid electrolyte Li1.5Al0.5Ge1.5(PO4)3 (LAGP) even after sintered at 600 °C in a nitrogen atmosphere from t...

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Bibliographic Details
Published in:Denki kagaku oyobi kōgyō butsuri kagaku 2023/06/14, Vol.91(6), pp.067003-067003
Main Authors: KAWANO, Yoichiro, KATO, Akihiko, USUI, Hiroyuki, DOMI, Yasuhiro, SAKAGUCHI, Hiroki
Format: Article
Language:eng ; jpn
Subjects:
All-solid-state Battery
Amorphous materials
Anatase
Anodes
Aqueous electrolytes
Batteries
Conductors
Discharge
Electrochemistry
Electrode materials
Electrolytes
Lithium
Lithium ions
Multilayers
NASICON
Nonaqueous electrolytes
Raman Spectroscopy
Rechargeable batteries
Rutile
Rutile-type TiO2
Sintering
Solid electrolytes
Solid state
Titanium dioxide
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Summary:We have been developing sintered multilayer oxide-based all-solid-state batteries. Anode active material rutile-type TiO2 was not reacted with amorphous Na superionic conductor (NASICON)-type solid electrolyte Li1.5Al0.5Ge1.5(PO4)3 (LAGP) even after sintered at 600 °C in a nitrogen atmosphere from the XRD patterns. The charge/discharge behavior of the electrochemical measuring cell (when using a non-aqueous electrolyte) was not different from that of rutile-type TiO2. However, anatase-type TiO2 charge/discharge behavior changed after sintering process. Additionally, in the result of the input/output characteristics using multilayer oxide-based all-solid-state battery, rutile-type TiO2 as anode material was 3 times higher discharge capacity than anatase-type TiO2 at current value 25.6 µA mm−2. Finally, we successfully measured the Raman spectroscopy of all-solid-battery and rutile-type TiO2 Raman shift peaks were reversibility during charge/discharge. Based on these findings, we conclude that rutile-type TiO2 maintained a strong crystalline structure and high Li diffusivity even when sintered with amorphous LAGP. It suggested that rutile-type TiO2 is suitable as anode material for oxide-based all-solid-state batteries requiring the sintering process.
ISSN:1344-3542
2186-2451
DOI:10.5796/electrochemistry.23-00023